$log\left(7+x\right)+log5=2$
$25+\left(7-5\right)\cdot\left(12+4\cdot\left(8-3\right)\right)$
$8x^2+20x^2y^2+50y^2$
$5x-1=20-2x$
$16-40b+25b^2$
$12h^2-60h+75$
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